Change of shape of geological salt bodies submitted to stress
Adits in deformed rock salt. Salt mine of Altaussee, Austria
Salt deformation is the change of shape of natural salt bodies in response to forces and mechanisms that controls salt flow. Such deformation can generate large salt structures such as underground salt layers, salt diapirs or salt sheets at the surface. Strictly speaking, salt structures are formed by rock salt that is composed of pure halite (NaCl) crystal. However, most halite in nature appears in impure form, therefore rock salt usually refers to all rocks that composed mainly of halite, sometimes also as a mixture with other evaporites such as gypsum and anhydrite.[1] Earth's salt deformation generally involves such mixed materials.
Due to the unique physical and chemical properties of rock salt such as its low density, high thermal conductivity and high solubility in water, it deforms distinctively in underground and surface environments compared with other rocks. Instability of rock salt is also given by its low viscosity, which allows rock salt to flow as a fluid. As the rock salt flows, a variety of salt structures are formed. Therefore, basins containing salt deform more easily than those lacking salt.[1]
^ abHudec, Michael R.; Jackson, Martin P.A. (May 2007). "Terra infirma: Understanding salt tectonics". Earth-Science Reviews. 82 (1–2): 1–28. Bibcode:2007ESRv...82....1H. doi:10.1016/j.earscirev.2007.01.001. ISSN 0012-8252.
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